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Charge transporting varnish and charge transporting thin film using the same

a charge transporting film and charge technology, applied in the direction of electroluminescent light sources, coatings, electric conductive paints, etc., can solve the problems of color purity and color reproducibility of organic el devices, color film, color purity, etc., to improve other characteristics, reduce the coloration of charge transporting films, and improve light transmittance

Inactive Publication Date: 2019-11-28
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a charge transporting varnish that contains a conventional oligoaniline compound, which is a colored substance. However, the charge transporting film produced using this varnish has significantly improved light transparency in the visible region, which reduces the coloring of the film and improves its appearance. Using this charge transporting varnish can also improve various characteristics of the organic EL device manufactured using this film without modifying the chemical structure of conventional oligoaniline compounds.

Problems solved by technology

The coloration of the charge transporting film is known to lower the color purity and color reproducibility of organic EL devices.
Moreover, such coloration presents a problem in various full-color techniques for organic EL displays, such as tricolor luminescence, white color luminescence, and color conversion, and becomes a considerable obstacle in the stable manufacture of organic EL devices.
The problem is, however, that since most oligoaniline compounds are colored substances, forming a charge transporting film using an oligoaniline compound results in a colored film.

Method used

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  • Charge transporting varnish and charge transporting thin film using the same
  • Charge transporting varnish and charge transporting thin film using the same
  • Charge transporting varnish and charge transporting thin film using the same

Examples

Experimental program
Comparison scheme
Effect test

example 1-1

[0229]First, under a nitrogen atmosphere, 0.060 g of the aniline derivative represented by formula (A1) synthesized according to the method described in WO 2013 / 084664 and 0.120 g of the arylsulfonic acid represented by formula (S1) synthesized according to the method described in WO 2006 / 025342 were dissolved in 5.8 g of 1,3-dimethyl-2-imidazolidinone. To this was added 7.8 g of 2,3-butanediol and 4.2 g of dipropylene glycol monomethyl ether, followed by stirring, after which 2.029 g of a silica sol dispersed in ethylene glycol (EG-ST, manufactured by Nissan Chemical Industries, Ltd., particle size: 10 nm-15 nm, SiO2: 20.5 wt. %) was added and stirred to obtain a varnish for forming a hole injection layer.

example 2-1

[0231]The varnish obtained in Example 1-1 was applied to a quartz substrate using a spin coater, and then dried by baking in an air atmosphere at 80° C. for 1 minute. Next, the dried quartz substrate was baked at 230° C. for 15 minutes in an air atmosphere to form a uniform film of 50 nm thickness on the quartz substrate.

example 3-1

[0235]The varnish obtained in Example 1-1 was applied to an ITO substrate using a spin coater, and was subsequently dried at 80° C. under air atmosphere for 1 minute. Subsequently, the dried substrate was baked at 230° C. for 15 minutes under air atmosphere to form a uniform film, 50 nm thick, on the ITO substrates. For the ITO substrate, a glass substrate (25 mm×25 mm×0.7 t) on the surface of which a patterned indium tin oxide (ITO) film having a thickness of 150 nm was formed was used, and the impurities on the surface of the glass substrate were removed by an O2 plasma cleaning device (150 W, 30 seconds) prior to use.

[0236]Next, α-NPD (N,N′-di(1-naphthyl)-N,N′-diphenylbenzidine) was deposited using an vacuum evaporator (degree of vacuum: 1.0×10−5 Pa) to a thickness of 120 nm at a rate of 0.2 nm / sec on the ITO substrate on which the film was formed. Next, another film of HTEB-01 (an electron blocking material manufactured by Kanto Chemical Co., Ltd.) was formed having a thickness ...

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Abstract

Disclosed are a charge transporting varnish comprising a specific oligoaniline compound, an electron accepting dopant, a metal oxide nanoparticle, and an organic solvent; a charge transporting film prepared from the charge transporting varnish; an electronic device and an organic electroluminescent device having the charge transporting film; and a method for producing the charge transporting film using the charge transporting varnish.

Description

TECHNICAL FIELD[0001]This application claims priority to Japanese Patent Application No. 2017-006991, filed on Jan. 18, 2017, and Japanese Patent Application No. 2017-126778, filed on Jun. 28, 2017. The entire contents of these applications are expressly incorporated herein by this reference.[0002]The present invention relates to a charge transporting varnish. More particularly, the present invention relates to a charge transporting varnish comprising particular components and a charge transporting thin film formed using the same.BACKGROUND ART[0003]In recent years, oligoaniline compounds have been used as the charge transporting material in the hole injection layer in organic electroluminescence (hereinafter referred to as “organic EL”) devices, and efforts are being made to improve various properties of these compounds. Examples of such properties include charge transportability, and luminous efficacy and luminance characteristics when used in an organic EL device, as well as solu...

Claims

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Application Information

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IPC IPC(8): C09D5/24C09D7/61C09D7/20H01L51/00
CPCC09D7/61H01L51/0059H01L51/5088H01L51/0003C09D7/20H01L51/0058C09D5/24C09D179/02C09D7/63C08G73/0266C08K2201/011H10K85/111H10K50/14H10K50/17C08K3/36C08K5/42H05B33/10C08G73/026H10K71/30H10K71/12H10K85/631H10K85/324H10K85/342Y02E10/549H10K85/626
Inventor NAKAIE, NAOKIYOSHITAKE, KEIKO
Owner NISSAN CHEM IND LTD
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